A compact PICAXE-28X2 module which contains the popular PICAXE-28X2 (PIC18F25K22) chip, voltage regulator, download socket, and reset switch in a convenient 28-pin, 0.6" wide, format. Supplied as an assembled and ready to use module it is ideal for breadboarding work but will also find a suitable place in other projects.

This 28X2 module supports up to 22 inputs/outputs with 16 analogue/touch sensor channels with an operating speed up to 16MHz using an internal oscillator and 64MHz using an on-board resonator. This chip supports 4 internal and up to 32 external program slots and is capable of acting as an i2c slave device.

The 28X2 supports enhanced features such as configurable i/o pins, ring tone music and touch sensor inputs, i2c, spi and high-speed serial with background receive. Scratchpad memory plus separate Data EEPROM and Data Table are supported.

Specification:

Note that the PICAXE-28X2 module is supplied with a single 28-way 0.6" DIL socket. It is recommended to connect the PICAXE-28X2 module to a circuit board using this connector rather than directly soldering the PICAXE-28X2 module to the circuit board.

The following table gives a brief summary of the various PICAXE chips.

For a more detailed comparison please see the PICAXE manuals and pinout diagrams.

Please note that the PICAXE-28X2 module pinout is not the same as the pinout for a PICAXE-28X2 microcontroller.

Feature	08M2	14M2	18M2	20M2	20X2	28X2	40X2
Memory Capacity (bytes)	2048	2048	2048	2048	4096	4096	4096
RAM (bytes)	128	512	256	512	256	1280	1280
Byte Variables (bytes)	28	28	28	28	56	56	56
Input/Outputs Pins	6	12	16	18	18	22	33
ADC/Touch Pins	3	7	10	11	11	16	27
Max. Freq. (MHz)	32	32	32	32	64	64	64
Serial In/Out	Yes	Yes	Yes	Yes	Yes	Yes	Yes
Infrared In/Out	Yes	Yes	Yes	Yes	Yes	Yes	Yes
I2C	Yes	Yes	Yes	Yes	Yes	Yes	Yes
Tune (ring tones)	Yes	Yes	Yes	Yes	Yes	Yes	Yes
Parallel Tasks	4	8	4	8	1	1	1
Program Slots	1	2	2	2	1	4	4